Mercurial > hg > dmlib
annotate src/dmgrowbuf.c @ 1744:e40227e994e2
Fix unitialized data accesses.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Sun, 10 Jun 2018 17:56:08 +0300 |
parents | a0986cfd6f9d |
children | 5e928618fdc8 |
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1 /* |
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2 * DMLib |
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3 * -- Growable buffer implementation |
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4 * Programmed and designed by Matti 'ccr' Hamalainen |
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5 * (C) Copyright 2018 Tecnic Software productions (TNSP) |
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6 */ |
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7 #include "dmgrowbuf.h" |
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8 |
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9 //#define DM_GROWBUF_DEBUG 1 |
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10 |
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11 #ifdef DM_GROWBUF_DEBUG |
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12 # define DM_DBG(...) do { fprintf(stderr, __VA_ARGS__); } while (0) |
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13 #else |
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14 # define DM_DBG(...) do { } while (0) |
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15 #endif |
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16 |
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17 |
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18 int dmGrowBufInit(DMGrowBuf *buf) |
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19 { |
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20 DM_DBG("dmGrowBufInit(%p)\n", buf); |
1687 | 21 |
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22 if (buf == NULL) |
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23 return DMERR_NULLPTR; |
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24 |
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25 memset(buf, 0, sizeof(DMGrowBuf)); |
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26 |
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27 return DMERR_OK; |
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28 } |
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29 |
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30 |
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31 int dmGrowBufAlloc(DMGrowBuf *buf, const size_t initial, const size_t mingrow) |
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32 { |
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33 int res; |
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34 |
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35 DM_DBG("dmGrowBufAlloc(%p, %" DM_PRIu_SIZE_T ", %" DM_PRIu_SIZE_T ")\n", |
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36 buf, initial, mingrow); |
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37 |
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38 if ((res = dmGrowBufInit(buf)) != DMERR_OK) |
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39 return res; |
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40 |
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41 buf->len = 0; |
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42 buf->offs = 0; |
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43 buf->size = initial; |
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44 buf->mingrow = mingrow; |
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45 buf->allocated = FALSE; |
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46 buf->backwards = FALSE; |
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47 buf->is_const = FALSE; |
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48 |
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49 // Allocate the data |
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50 if ((buf->data = dmMalloc0(initial)) == NULL) |
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51 return DMERR_MALLOC; |
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52 |
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53 return DMERR_OK; |
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54 } |
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55 |
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56 |
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57 int dmGrowBufNew(DMGrowBuf **pbuf, const size_t initial, const size_t mingrow) |
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58 { |
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59 int res; |
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60 if (pbuf == NULL) |
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61 return DMERR_NULLPTR; |
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62 |
1687 | 63 DM_DBG("dmGrowBufNew(%p, %" DM_PRIu_SIZE_T ", %" DM_PRIu_SIZE_T ")\n", |
64 pbuf, initial, mingrow); | |
65 | |
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66 if ((*pbuf = dmMalloc0(sizeof(DMGrowBuf))) == NULL) |
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67 return DMERR_MALLOC; |
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68 |
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69 if ((res = dmGrowBufAlloc(*pbuf, initial, mingrow)) != DMERR_OK) |
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70 { |
1459 | 71 // The "allocated" flag has not yet been set |
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72 dmGrowBufFree(*pbuf); |
1459 | 73 |
74 // .. thus free the allocated struct here | |
75 dmFreeR(pbuf); | |
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76 return res; |
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77 } |
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78 |
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79 (*pbuf)->allocated = TRUE; |
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80 return res; |
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81 } |
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82 |
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83 |
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84 void dmGrowBufFree(DMGrowBuf *buf) |
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85 { |
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86 DM_DBG("dmGrowBufFree(%p)\n", buf); |
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87 if (buf != NULL) |
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88 { |
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89 DM_DBG( |
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90 " buf->data = %p\n" |
1701 | 91 " buf->allocated = %s\n" |
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92 " buf->is_const = %s\n", |
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93 buf->data, |
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94 buf->allocated ? "YES" : "NO", |
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95 buf->is_const ? "YES" : "NO"); |
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96 |
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97 if (buf->is_const) |
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98 return; |
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99 |
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100 dmFreeR(&buf->data); |
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101 |
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102 if (buf->allocated) |
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103 dmFree(buf); |
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104 } |
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105 } |
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106 |
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107 |
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108 DMGrowBuf * dmGrowBufConstCopy(DMGrowBuf *dst, const DMGrowBuf *src) |
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109 { |
1701 | 110 if (dst == NULL) |
111 return NULL; | |
112 | |
113 DM_DBG("dmGrowBufConstCopy(dst=%p, src=%p):\n" | |
114 " data=%p, size=%" DM_PRIu_SIZE_T ", len=%" DM_PRIu_SIZE_T ", offs=%" DM_PRIu_SIZE_T "\n", | |
115 dst, src, src->data, src->size, src->len, src->offs); | |
116 | |
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117 memcpy(dst, src, sizeof(DMGrowBuf)); |
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118 dst->is_const = TRUE; |
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120 return dst; |
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121 } |
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122 |
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123 |
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124 DMGrowBuf * dmGrowBufCreateFrom(DMGrowBuf *dst, Uint8 *data, size_t len) |
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125 { |
1701 | 126 if (dmGrowBufInit(dst) != DMERR_OK) |
127 return NULL; | |
128 | |
129 DM_DBG("dmGrowBufCreateFrom(dst=%p, data=%p, len=%" DM_PRIu_SIZE_T ")\n", | |
130 dst, data, len); | |
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131 |
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132 dst->data = data; |
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133 dst->len = dst->size = len; |
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134 dst->is_const = TRUE; |
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135 |
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136 return dst; |
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137 } |
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138 |
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139 |
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140 static BOOL dmGrowBufRealloc(DMGrowBuf *buf, const size_t nsize, const BOOL clear) |
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141 { |
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142 DM_DBG("dmGrowBufRealloc(%p):\n" |
1701 | 143 " size=%" DM_PRIu_SIZE_T ", nsize=%" DM_PRIu_SIZE_T |
144 ", offs=%" DM_PRIu_SIZE_T "\n", | |
145 buf, buf->size, nsize, buf->offs); | |
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146 |
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147 if (buf->is_const) |
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148 return FALSE; |
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149 |
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150 // Can't be smaller than current size! |
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151 if (nsize < buf->size) |
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152 return FALSE; |
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153 |
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154 if ((buf->data = dmRealloc(buf->data, nsize)) == NULL) |
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155 return FALSE; |
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156 |
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157 // For buffers growing backwards, we must move the |
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158 // current data to the end of the buffer .. |
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159 size_t clrsize = nsize - buf->size; |
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160 if (buf->backwards) |
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161 { |
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162 memmove(buf->data + clrsize, buf->data, clrsize); |
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163 buf->offs += clrsize; |
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164 } |
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165 |
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166 // Check if we need to clear the newly allocated area? |
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167 if (clear) |
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168 { |
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169 if (buf->backwards) |
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170 memset(buf->data, 0, clrsize); |
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171 else |
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172 memset(buf->data + buf->size, 0, clrsize); |
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173 } |
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174 |
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175 buf->size = nsize; |
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176 |
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177 return TRUE; |
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178 } |
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179 |
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180 |
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181 // |
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182 // Grow the buffer by "amount" bytes, but at least by buf->mingrow, |
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183 // if there is not enough space for at least that amount compared to |
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184 // current buffer "len". |
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185 // |
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186 BOOL dmGrowBufGrow(DMGrowBuf *buf, const size_t amount) |
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187 { |
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188 size_t grow = (amount > buf->mingrow) ? amount : buf->mingrow; |
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189 |
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190 if (buf->is_const) |
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191 return FALSE; |
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192 |
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193 if (buf->data == NULL || |
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194 (buf->backwards && amount >= buf->offs) || |
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195 (!buf->backwards && buf->offs + amount >= buf->size)) |
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196 { |
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197 if (!dmGrowBufRealloc(buf, buf->size + grow, TRUE)) |
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198 return FALSE; |
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199 } |
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200 |
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201 buf->len += amount; |
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202 return TRUE; |
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203 } |
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204 |
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205 |
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206 // |
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207 // Grow the buffer if "nsize" is larger than the current buffer size. |
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208 // Buffer is enlarged to nsize + mingrow. |
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209 // |
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210 BOOL dmGrowBufCheckGrow(DMGrowBuf *buf, const size_t nsize) |
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211 { |
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212 if (buf->is_const) |
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213 return FALSE; |
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214 |
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215 if (buf->data == NULL || nsize > buf->size) |
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216 { |
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217 if (!dmGrowBufRealloc(buf, nsize + buf->mingrow, TRUE)) |
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218 return FALSE; |
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219 } |
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220 |
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221 if (nsize > buf->len) |
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222 buf->len = nsize; |
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223 |
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224 return TRUE; |
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225 } |
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226 |
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227 |
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228 static void dmGrowBufUpdate(DMGrowBuf *buf) |
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229 { |
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230 if (buf->offs < buf->min_offs) |
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231 buf->min_offs = buf->offs; |
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232 |
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233 if (buf->offs > buf->max_offs) |
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234 buf->max_offs = buf->offs; |
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235 } |
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236 |
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237 |
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238 BOOL dmGrowBufPut(DMGrowBuf *buf, const Uint8 *data, const size_t len) |
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239 { |
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240 if (data == NULL) |
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241 return FALSE; |
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242 |
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243 if (!dmGrowBufGrow(buf, len)) |
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244 return FALSE; |
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245 |
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246 if (buf->backwards) |
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247 { |
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248 if (buf->literal) |
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249 { |
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250 buf->offs -= len; |
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251 memcpy(buf->data + buf->offs, data, len); |
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252 } |
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253 else |
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254 { |
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255 for (size_t n = 0; n < len; n++) |
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256 buf->data[buf->offs--] = data[n]; |
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257 } |
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258 } |
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259 else |
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260 { |
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261 memcpy(buf->data + buf->offs, data, len); |
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262 buf->offs += len; |
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263 } |
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264 |
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265 dmGrowBufUpdate(buf); |
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266 |
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267 return TRUE; |
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268 } |
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269 |
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270 |
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271 BOOL dmGrowBufPutU8(DMGrowBuf *buf, const Uint8 value) |
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272 { |
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273 if (!dmGrowBufGrow(buf, sizeof(Uint8))) |
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274 return FALSE; |
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275 |
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276 buf->data[buf->offs] = value; |
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277 if (buf->backwards) |
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278 buf->offs--; |
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279 else |
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280 buf->offs++; |
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281 |
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282 dmGrowBufUpdate(buf); |
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283 |
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284 return TRUE; |
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285 } |
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286 |
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287 |
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288 BOOL dmGrowBufPutU16BE(DMGrowBuf *buf, const Uint16 val) |
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289 { |
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290 if (buf->literal && buf->backwards) |
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291 { |
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292 return |
1706
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293 dmGrowBufPutU8(buf, val & 0xff) && |
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294 dmGrowBufPutU8(buf, (val >> 8) & 0xff); |
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295 } |
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296 else |
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297 { |
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298 return |
1706
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299 dmGrowBufPutU8(buf, (val >> 8) & 0xff) && |
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300 dmGrowBufPutU8(buf, val & 0xff); |
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301 } |
1454
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|
302 } |
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|
303 |
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|
304 |
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|
305 BOOL dmGrowBufPutU16LE(DMGrowBuf *buf, const Uint16 val) |
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306 { |
1697
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307 if (buf->literal && buf->backwards) |
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308 { |
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309 return |
1706
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310 dmGrowBufPutU8(buf, (val >> 8) & 0xff) && |
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311 dmGrowBufPutU8(buf, val & 0xff); |
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312 } |
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313 else |
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314 { |
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315 return |
1706
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316 dmGrowBufPutU8(buf, val & 0xff) && |
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317 dmGrowBufPutU8(buf, (val >> 8) & 0xff); |
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318 } |
1454
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|
319 } |
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|
320 |
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|
321 |
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|
322 BOOL dmGrowBufPutU32BE(DMGrowBuf *buf, const Uint32 val) |
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323 { |
1697
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324 if (buf->literal && buf->backwards) |
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325 { |
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326 return |
1706
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327 dmGrowBufPutU8(buf, (val >> 24) & 0xff) && |
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|
328 dmGrowBufPutU8(buf, (val >> 16) & 0xff) && |
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|
329 dmGrowBufPutU8(buf, (val >> 8) & 0xff) && |
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Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
330 dmGrowBufPutU8(buf, val & 0xff); |
1697
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331 } |
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332 else |
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|
333 { |
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334 return |
1706
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Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
335 dmGrowBufPutU8(buf, val & 0xff) && |
311b14855a1e
Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
336 dmGrowBufPutU8(buf, (val >> 8) & 0xff) && |
311b14855a1e
Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
337 dmGrowBufPutU8(buf, (val >> 16) & 0xff) && |
311b14855a1e
Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
338 dmGrowBufPutU8(buf, (val >> 24) & 0xff); |
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|
339 } |
1454
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|
340 } |
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diff
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|
341 |
fff3b58d031c
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parents:
diff
changeset
|
342 |
fff3b58d031c
Add a growable buffer implementation.
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diff
changeset
|
343 BOOL dmGrowBufPutU32LE(DMGrowBuf *buf, const Uint32 val) |
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|
344 { |
1697
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|
345 if (buf->literal && buf->backwards) |
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Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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346 { |
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|
347 return |
1706
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Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
348 dmGrowBufPutU8(buf, val & 0xff) && |
311b14855a1e
Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
349 dmGrowBufPutU8(buf, (val >> 8) & 0xff) && |
311b14855a1e
Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
350 dmGrowBufPutU8(buf, (val >> 16) & 0xff) && |
311b14855a1e
Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
351 dmGrowBufPutU8(buf, (val >> 24) & 0xff); |
1697
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Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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352 } |
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Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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|
353 else |
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Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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|
354 { |
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|
355 return |
1706
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Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
356 dmGrowBufPutU8(buf, (val >> 24) & 0xff) && |
311b14855a1e
Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
357 dmGrowBufPutU8(buf, (val >> 16) & 0xff) && |
311b14855a1e
Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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|
358 dmGrowBufPutU8(buf, (val >> 8) & 0xff) && |
311b14855a1e
Ehm .. the boolean logic conditions used in dmGrowBufPutU{16,32}{LE,BE}()
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changeset
|
359 dmGrowBufPutU8(buf, val & 0xff); |
1697
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Refactor DMGrowBuf so that there can be buffers that grow "backwards".
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|
360 } |
1454
fff3b58d031c
Add a growable buffer implementation.
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
361 } |
1699
f71cd6691e05
Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents:
1697
diff
changeset
|
362 |
f71cd6691e05
Implement dmGrowBufGetU8().
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1697
diff
changeset
|
363 |
f71cd6691e05
Implement dmGrowBufGetU8().
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|
364 BOOL dmGrowBufGetU8(DMGrowBuf *buf, Uint8 *value) |
f71cd6691e05
Implement dmGrowBufGetU8().
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365 { |
1703
fcc568e03bed
Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents:
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366 if (buf->backwards) |
1699
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Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents:
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367 { |
1703
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Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents:
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368 if (buf->offs > 0) |
fcc568e03bed
Clarify dmGrowBufGetU8() a bit.
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369 *value = buf->data[buf->offs--]; |
fcc568e03bed
Clarify dmGrowBufGetU8() a bit.
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parents:
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370 else |
fcc568e03bed
Clarify dmGrowBufGetU8() a bit.
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parents:
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371 return FALSE; |
1699
f71cd6691e05
Implement dmGrowBufGetU8().
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parents:
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372 } |
f71cd6691e05
Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents:
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373 else |
f71cd6691e05
Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents:
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374 { |
1744
e40227e994e2
Fix unitialized data accesses.
Matti Hamalainen <ccr@tnsp.org>
parents:
1707
diff
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375 if (buf->offs < buf->len) |
1703
fcc568e03bed
Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents:
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diff
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376 *value = buf->data[buf->offs++]; |
fcc568e03bed
Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents:
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377 else |
fcc568e03bed
Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents:
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378 return FALSE; |
1699
f71cd6691e05
Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents:
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379 } |
f71cd6691e05
Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents:
1697
diff
changeset
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380 |
1703
fcc568e03bed
Clarify dmGrowBufGetU8() a bit.
Matti Hamalainen <ccr@tnsp.org>
parents:
1702
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381 return TRUE; |
1699
f71cd6691e05
Implement dmGrowBufGetU8().
Matti Hamalainen <ccr@tnsp.org>
parents:
1697
diff
changeset
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382 } |